Apple Macs targeted by KeRanger ransomware for first time

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Apple customers were targeted by hackers over the weekend in the first campaign against Macintosh computers using a pernicious type of software known as ransomware, researchers with Palo Alto Networks have revealed.

Ransomware, one of the fastest-growing types of cyber threats, encrypts data on infected machines, then typically asks users to pay ransoms in hard-to-trace digital currencies to get an electronic key so they can retrieve their data.

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Security experts estimate that ransoms total hundreds of millions of dollars a year from such cyber criminals, who typically target users of Microsoft’s Windows operating system.

Ryan Olson, threat intelligence director at Palo Alto, said the “KeRanger” malware, which appeared on Friday 4 March, was the first functioning ransomware attacking Apple’s Mac computers.

“This is the first one in the wild that is definitely functional, encrypts your files and seeks a ransom,” Olson said in a telephone interview with Reuters.

An Apple representative said the company had taken steps over the weekend to prevent attacks by revoking a digital certificate from a legitimate Apple developer that enabled the rogue software to install on Macs. The representative said he could not immediately provide other details.

The malware is programmed to encrypt files on an infected personal computer three days after the original infection, according to Olson.

That means that if Apple’s steps prove ineffective in neutralisingmalware that has already infected Macs, the earliest victims will have their files encrypted on Monday, three days after the malicious program first appeared on the Transmission website, he said.

The Transmission site offers the open source software that was infected with the ransomware.

Palo Alto said it planned to release a blog advising Mac users on ways to check to see if they were infected with the virus and steps they can take to protect against it harm their data, Olson said.

Transmission is one of the most popular Mac applications used to download software, videos, music and other data through the BitTorrent peer-to-peer information sharing network, according to Olson.

Representatives with Transmission could not be reached immediately for comment.

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Transmission carried a warning on Sunday saying that version 2.90 of its Mac software had been infected with malware.

It advised users to immediately upgrade to version 2.91 of the software, which was available on its website, or delete the malicious one.

It also provided technical information on how users could check to see if they were affected.